Studies such as the European CabinAir project have shown that normally the levels of chemical and biological contaminants in aircraft are less than in many ground based work environments. The independent Committee on Toxicity completed a substantial review of evidence in September 2007 and concluded that it did not establish (or rule out) a link between cabin air and pilot ill health. The Committee recommended research to sample cabin air during ‘fume events’, which it estimated occur on 0.05 per cent. of flights overall. Such sampling has not been done before. The Government accepted the recommendation and has begun work to develop the methodology. Details are on the Department for Transport website.